K. A. Ramos-Moreno, J. R. Vázquez-Labrada, and M. Moreno-Martínez, “Need for Fidel Castro’s environmental thought in the teaching-learning process of Marxism-Leninism”, Environmental Research and Ecotoxicity, vol. 4, p. 203, Nov. 2025, doi: 10.56294/ere2025203.